CN85106516A - The galvanic deposit of zinc-iron alloys coating - Google Patents

The galvanic deposit of zinc-iron alloys coating Download PDF

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Publication number
CN85106516A
CN85106516A CN85106516.3A CN85106516A CN85106516A CN 85106516 A CN85106516 A CN 85106516A CN 85106516 A CN85106516 A CN 85106516A CN 85106516 A CN85106516 A CN 85106516A
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electrolytic solution
grams per
liter
per liter
zinc
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CN85106516.3A
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CN1004972B (en
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威廉·罗伯特·约翰逊
拉里·爱德华·菲斯特
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United States Steel Corp
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United States Steel Corp
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/56—Electroplating: Baths therefor from solutions of alloys
    • C25D3/565—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of zinc

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Electroplating And Plating Baths Therefor (AREA)
  • Electroplating Methods And Accessories (AREA)

Abstract

When electrodepositing zinc-iron-zinc alloy coating, current density range is that 43-172 amperes/square decimeters, flow process speed are 30.4-152 meters/minutes, can plate to such an extent that adhere to good bright zinc-iron plating, wherein iron content 10-20%.Its temperature of used electrolytic solution remains between 54.4-71.1 ℃, contains FeCl in the electrolytic solution 2, ZnCl 2, KCl, K 2SO 4, a kind of sequestrant for example citric acid and a small amount of a kind of addition compound of mainly forming by polyalkylene glycol.

Description

The galvanic deposit of zinc-iron alloys coating
Involved in the present invention is the plating of zinc-iron alloys coating, and more particularly, involved in the present invention being to use with muriate is that the electrolytic solution of main salt is produced this coating.
In the past few years, people constantly pay close attention to the protection against corrosion problem of automobile, have caused increasing research activities thereby can provide steel matrix in development aspect the coating of claimed performance.The product of handling through hot dip process now has been successfully used to various non-exposed parts.Need the place of good surface to adopt the single face electrolytic coating and apply zinc-rich paint at those.For higher rustless property,, constantly use the two-sided product of handling through hot dip process respectively particularly in order to reach decorative effect.In order to satisfy the needs that reduce zinc coating weight, a variety of Zinc alloy electroplating layers have been released.People find, zinc with than its more expensive metal, for example nickel, iron, cobalt, chromium, tin and tungsten common deposited can provide the Corrosion Protection that is better than thicker zinc coating with relatively thinner coating in various accelerated corrosion tests.In some cases, people find that also the painting performance of these zn alloy coatings is more superior than the painting performance of pure zinc surface.
What many researchists carried out studies show that, the zinc-iron alloys that contains 10～20% iron thickness provide during for 5～10 microns corrosion resistance nature, painting performance and formability can aspect best testing data.Various electroplating bath devices and electrolytic solution all are suitable for electroplating this zinc-iron alloys coating.People such as T.Irie pointed out on the 4th AES band continuous electroplating discussion proceedings in 1984, be that the cathode efficiency of various electroplate liquids of main salt and electroconductibility is superior to greatly with vitriol with muriate be the electroplate liquid of main salt, thereby last class electroplate liquid has higher productivity, and power consumption is also low.Yet pointed as people such as T.Irie, the iron level in the settled layer is the function of used current density still not, also is band flow process function of speed, thereby iron level sharply increases along with the increase of current density or along with the minimizing of flow process speed.But, have now found that, improve chlorine ion concentration greatly and just can prevent this irregular deposition.
Improving chlorine ion concentration so that when overcoming the erratic deposition problem basically, the outward appearance of settled layer and sticking power then by electroplate density determined-so that for to obtain satisfactory coating outward appearance must employing greater than the current density of 100 amperes/square decimeter (929 amperes/square chi).Although production firm generally all would rather use about 1000 amperes/square chi (107.6 amperes/square decimeter) or bigger current density, so that boost productivity to greatest extent, but such situation often appears, for example because the fault of mechanical aspects and the fault of band e Foerderanlage, to electroplate the speed of flow process with regard to having to and slow down for reaching required coating weight, and electroplate used current density and also must correspondingly reduce.Therefore, people just need a kind of electrolytic solution that following condensation performance can be provided: (ⅰ) in the flow process speed and current density range of broadness, iron and zinc can be with constant ratio codepositions, and (ⅱ) in same broad scope, coating has desired outward appearance and sticking power.Have now found that, can will be that the electrolytic solution of main salt is improved with muriate with the method for adding a small amount of sulfate radical, and obtain so comprehensive plating performance, but also find, this plating performance can adopt a kind of addition compound further to strengthen, and this addition compound contains the polyalkylene glycol of one or more molecular weight within 600～1050 scopes.Read following explanation in conjunction with appending claims and accompanying drawing, the benefit that just can better understand this discovery and brought, wherein:
Accompanying drawing 1 is to be used for illustrating that current density and flow process speed when using conventional zinc-electrolytic iron liquid form the three-dimensional plot of influence to coating,
Accompanying drawing 2 is to be used for illustrating the three-dimensional plot that obtains broad homogeneous coating scope when using electrolytic solution of the present invention.
Originally, carried out laboratory test in the circulation plating tank that designs for the strap electroplating condition on the simulate commercial, wherein electrolytic solution is crossed a negative electrode that leaves standstill and anode with the velocity flow that is equivalent to commercial band material plating flow process speed.Used the circulation plating tank of two kinds of different sizes, every kind of plating tank all can be simulated the flow process speed that is up to 600 chis/minute (180 meters/minute), and current density is up to 2500 amperes/square chi (269 amperes/square decimeter).Before electroplating, the steel sample with 0.79 mm thick carries out the electrolysis cleaning in alkalescence cleaning solution earlier, carries out acidleach then and handle in HCl solution.It is that the routine of main salt contains Fe that the research of beginning is to use with muriate 2+Ion and Zn 2+Ionic electrolytic solution carries out, and this electrolytic solution makes (Cl with the concentration ratio that is equivalent to required coating composition through dissolving with simple metal chloride salt -Total concn is not more than 240 grams per liters).This studies show that, for fear of produce irregular codeposition in this electrolytic solution, electroplating process must be limited in quite low current density and get off to carry out, also promptly less than 400 amperes/square chi (43 amperes/square decimeter).Use the resulting result of study of this electrolytic solution to show as Fig. 1.By this figure as seen, the iron level in the coating descends significantly with the raising of the increase of flow process speed and/or current density.This performance variation has hindered carries out the strap electroplating operation on the business equipment that main flow speed can change,
Confirm that afterwards conventional muriate zinc-electrolytic iron liquid can be improved, make the composition of coating become the function of the ratio of iron zinc in the electrolytic solution rather than the function of flow process speed or current density basically.Fig. 2 shows the result of study that adopts improved electrolytic solution gained, and wherein the iron zinc in the coating is invariable than in close scope of the electric current of broadness and flow process velocity range basically.The coating that plates with this electrolytic solution that has improved not only adheres to well, and the outward appearance that is presented also meets the requirements.But, should be noted that, when the iron level in the coating is the function of the percentage ratio that iron accounts for total metal concentration in the electrolytic solution basically, in the coating in a little higher than electrolytic solution of the ratio of iron iron to the ratio of total metal, for example iron is 10% of total metal contents in soil in the electrolytic solution, and the iron level in the coating then is about 13%.
With muriate is that the electrolytic solution of main salt contains following composition:
(a) amount is the Fe of 4-10 grams per liter 2+-with FeCl 2Form be added to good,
(b) amount is the Zn of 50-80 grams per liter 2+-with ZnCl 2Form be added to goodly, have now found that Fe 2+This concentration range sufficiently high concentration of metal ions is provided, electroplating activity is still carried out under up to 1600 amperes/square chi situation in current density,
(c) amount is the Cl of 240-300 grams per liter --be added to goodly with the form of KCl, consistent with people's such as Irie discovery, in order to prevent irregular codeposition, needed minimum quantity is about 240 grams per liters.Cl -Concentration improves, and can also improve the electroconductibility of tank liquor, thereby reduces power consumption,
(d) amount is the SO of 6-12 grams per liter 2- 4-with K 2SO 4Form be added to goodly, it is necessary so that can obtain bright coating that the sulfate radical of this concentration range is that (1) provides the long-time stability of tank liquor and (2) to enlarge the current density range low value end of this scope (especially),
(e) present in an amount at least sufficient to certain sequestrant of preventing that insoluble ferric ions precipitation from coming out.Various sequestrants, for example Citrate trianion, acetate and succinate all can use.In electrolytic solution of the present invention, the amount of citrate is 0.5～5 grams per liter, and this is that special ideal-be added to the form of citric acid is good, and
(f) certain of 0.5～2 milliliter/liter contains the addition compound that molecular weight is one or more polyalkylene glycols of 600-1660.Addition compound with this character has been used for the galvanic deposit of pure zinc layer under approximately less than the situation of an order of magnitude in concentration.Have now found that,, can enlarge current density range and flow process velocity range when the consumption of these addition compound during greater than above-mentioned concentration, in this scope, can obtain adhering to good bright coating, in addition, the plating scope can also be enlarged, in this scope, the constant codeposition can be obtained.With the 0.7-1.2 milliliter/liter amount be used alone polyalkylene glycol or use the mixture of multiple polyalkylene glycol, have better effect.
In two kinds of different electroplanting devices-(ⅰ) a kind of tentative flow process of using conventional vertical through type electroplanting device, can supply with up to 32,000 electroplate ampere and can with the top speed of 500 chis/minute (152 meters/minute) handle width be to the maximum the band of 10 cun (2.54 decimeters) and (ⅱ) roughly with US3,483, a kind of radial electroplanting device that device shown in 113 is similar is verified breadboard result.A kind of device in back band along the major diameter deflector roll by the time can eliminate winding (Throwaround) and the edge thickens (edgebuild-uP), the conductive surface of major diameter deflector roll only is that the other parts of the middle body-guide roller surface of deflector roll garden side face are a kind of elastomericss.Owing to steel band tightly passes through around deflector roll, on the surface that the edge is close on the elastic part of deflector roll-prevents with deflector roll contacts galvanic deposit takes place.The opposite of band is equipped with a plurality of crooked shape anodes, and electroplate liquid circulates between anode and band.When use about 1 cun anode-band distance, use solubility zinc-base anode (for example pure Zn or zn-fe alloy) and use highly conductive, when being the electrolytic solution of main salt, electroplating power consumption and be lowered to minimum degree with muriate.A kind of electroplanting device in back can be used for producing single-face plating or two-sided coating, every can be in different time plating.By this design, can also plate different types of coating respectively on the two sides of band.Equally, also can be easily at the coating of each face plating with different thickness.
As noted above such, electrolytic solution of the present invention suits to use in any existing plating device.Desired zinc-iron alloys coating contains the Fe of 10-20%, the Fe that preferably contains 12-18%, it can be deposited on the steel band of advancing with the flow process speed of 100-500 chi/minute (30.4-152 rice/minute), and deposition process wherein is to use method from 400-1600 ampere/square chi (43-172 ampere/square decimeter) current density to band that supply with to finish.The temperature of electrolytic solution is with 130-160F(54.4-71.1 ℃) be good, pH value is that good, such electrolytic solution is crossed the surface of band with sufficiently high flow velocity with 2-3.5, so that can use essential current density.

Claims (8)

1, a kind of electrolytic solution of electrodeposited zn-fe alloy coating is mainly by 4-10 grams per liter Fe 2+, 50-80 grams per liter Zn 2+, 240-300 grams per liter Cl-, 6-12 grams per liter So 4 2-, the 0.5-5 grams per liter presents in an amount at least sufficient to prevent that ferric ion from generating sedimentary sequestrant, 0.5-2 milliliter/liter contain one or more molecular weight is that the addition compound and the surplus of the polyalkylene glycol of 600-1050 formed by water.
2, first of claims described electrolytic solution, wherein said sequestrant is a citrate, described polyalkylene glycol is a polyoxyethylene glycol.
3, first of claims described electrolytic solution, wherein said polyoxyethylene glycol consumption the 0.7-1.2 milliliter/liter scope in.
4, second of claims described electrolytic solution, wherein said polyalkylene glycol is a polyoxyethylene glycol, and its consumption the 0.7-1.2 milliliter/liter scope in.
5, with 30.4-152 rice/minute the flow process speed steel band of advancing on the method for galvanic deposit Zn-Fe alloy coating, galvanic deposit wherein is to be the current density of the electrolytic solution of main salt to band supply 43-172 ampere/square decimeter by solubility zinc-base anode with muriate, electrolytic solution circulates with sufficiently high flow velocity between band and anode and must realize to support this current density, it is characterized in that, galvanic deposit contains the used electrolytic solution of Zn-Fe bright coating of 10～20%Fe in described flow process speed and the close scope of electric current, and wherein electrolytic solution remains in 54.4-71.1 ℃ the temperature range and basically by 4-10 grams per liter Fe 2+, 50-80 grams per liter Zn 2+, 240-300 gram liter Cl -, 6-12 grams per liter SO 2- 4, the 0.5-5 grams per liter presents in an amount at least sufficient to prevent that ferric ion from generating sedimentary a kind of sequestrant, 0.5-2 milliliter/liter wherein contain one or more molecular weight to be formed by the addition compound and the excess water of the polyalkylene glycol of 600-1050.
6, the 5th of claims the described method, the pH value of wherein said electrolytic solution is 2-3.5.
7, the 6th of claims the described method, wherein said sequestrant is a citrate, and described polyalkylene glycol is a polyoxyethylene glycol.
8, the 7th of claims the described method, the amount ranges of wherein said polyoxyethylene glycol be the 0.7-1.2 milliliter/liter.
CN85106516.3A 1984-12-03 1985-08-30 Electrodeposition of an iron-zinc alloy coating Expired CN1004972B (en)

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US06/677,423 US4540472A (en) 1984-12-03 1984-12-03 Method for the electrodeposition of an iron-zinc alloy coating and bath therefor
USU.S.S.N677 1984-12-03
USU.S.S.N677,423 1984-12-03

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CN85106516A true CN85106516A (en) 1986-05-10
CN1004972B CN1004972B (en) 1989-08-09

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EP (1) EP0204708B1 (en)
JP (1) JPS62500941A (en)
CN (1) CN1004972B (en)
CA (1) CA1254168A (en)
DE (1) DE3580358D1 (en)
ES (1) ES8606914A1 (en)
WO (1) WO1986003522A1 (en)
ZA (1) ZA855908B (en)

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CN1300382C (en) * 2004-04-12 2007-02-14 昆明理工大学 Steel components and parts covered by Zn-Fe-RE cladding material, electroplating method and electrolyte
CN102667983A (en) * 2009-11-26 2012-09-12 松下电器产业株式会社 Electrolytic solution for aluminum electrolytic capacitor, and aluminum electrolytic capacitor using same
CN103429794A (en) * 2011-02-15 2013-12-04 埃托特克德国有限公司 Zinc-iron alloy layer material
CN103806029A (en) * 2012-11-14 2014-05-21 穆尔和本德公司 Method for producing a product from a flexible rolled strip material

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DE3619385A1 (en) * 1986-06-09 1987-12-10 Elektro Brite Gmbh ACID, SULFATE-CONTAINING BATH FOR THE GALVANIC DEPOSITION OF ZN-FE ALLOYS
DE3619384A1 (en) * 1986-06-09 1987-12-10 Elektro Brite Gmbh ACID CHLORIDE-CONTAINING BATH FOR GALVANIC DEPOSITION OF ZN-FE ALLOYS
GB2212816B (en) * 1987-11-26 1992-04-08 Nippon Steel Corp Zn-ni based composite electroplated material and multi-layer composite plated material
US5316653A (en) * 1992-07-30 1994-05-31 Usx Corporation Minimization of mounds in iron-zinc electrogalvanized sheet
US5628044A (en) * 1995-06-02 1997-05-06 Old Dominion University Pure iron-zinc intermetallic galvanneal calibration standards
US6096183A (en) * 1997-12-05 2000-08-01 Ak Steel Corporation Method of reducing defects caused by conductor roll surface anomalies using high volume bottom sprays
US6143160A (en) * 1998-09-18 2000-11-07 Pavco, Inc. Method for improving the macro throwing power for chloride zinc electroplating baths
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US8734579B2 (en) * 2009-11-18 2014-05-27 Jx Nippon Mining & Metals Corporation Aqueous solution containing divalent iron ions
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1300382C (en) * 2004-04-12 2007-02-14 昆明理工大学 Steel components and parts covered by Zn-Fe-RE cladding material, electroplating method and electrolyte
CN102667983A (en) * 2009-11-26 2012-09-12 松下电器产业株式会社 Electrolytic solution for aluminum electrolytic capacitor, and aluminum electrolytic capacitor using same
CN102667983B (en) * 2009-11-26 2014-10-01 松下电器产业株式会社 Electrolytic solution for aluminum electrolytic capacitor, and aluminum electrolytic capacitor using same
CN103429794A (en) * 2011-02-15 2013-12-04 埃托特克德国有限公司 Zinc-iron alloy layer material
CN105386098A (en) * 2011-02-15 2016-03-09 埃托特克德国有限公司 Zinc-iron alloy layer material
CN103429794B (en) * 2011-02-15 2016-11-09 埃托特克德国有限公司 zinc-iron alloy layer material
CN105386098B (en) * 2011-02-15 2018-06-22 埃托特克德国有限公司 Zinc-iron alloy layer material
CN103806029A (en) * 2012-11-14 2014-05-21 穆尔和本德公司 Method for producing a product from a flexible rolled strip material
CN103806029B (en) * 2012-11-14 2017-11-17 穆尔和本德公司 From the method for the band article of manufacture of flexible rolling

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JPS62500941A (en) 1987-04-16
EP0204708B1 (en) 1990-10-31
CA1254168A (en) 1989-05-16
EP0204708A1 (en) 1986-12-17
JPH0585640B2 (en) 1993-12-08
ZA855908B (en) 1986-03-26
DE3580358D1 (en) 1990-12-06
ES546397A0 (en) 1986-05-01
ES8606914A1 (en) 1986-05-01
WO1986003522A1 (en) 1986-06-19
CN1004972B (en) 1989-08-09
US4540472A (en) 1985-09-10

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